System of motor control.



PATENTED NOV. 19, 1907.

W. F. SCHNEIDER.

SYSTEM OF MOTOR CONTROL.

APPLICATION FILED NOV.11.1905.

INvsm'nn M/z'llzam F Schneider Mrmssss BY @iif UN [T E D ST AT ES FATE v1 OFFICE.

01110, .-\L .'Sit}.\'0.li TO THE BULLOCK ELECTRIC SYSTEMLOF MOTOR CONTROL.

Application Specification of Letters Patent.

filed November 11 1905. Serial No. 286 961i Patented Nov. 19, 1907. I

State of Ohio, hove invented certain new and nsolul improvements in Systems ot Motor Control. ol whit-h the l'ollowin; is n hill. olezir, and exact spooiliootion.

My inyention relate to svstems of motor rontrol and espoeinlly to systems of eontrol l'or motors whieh driy'o oortuin types-oi large machines as printing presses.

The systems ol oonlrol 'l'or motors which drive printing presses should he such thut: the press run he stopped and started evon y' and without shook and eun. he driven it very low speeds. A system otoontrol suitzihle tor these purposes is illustrated in United Notes Patent to Burlto No. (HLMH. issued Soptemhor 27th, 188th, in this system. the motor driven at widely ditl'el'ent. speeds vy '\':n 'in f the potontiul and the amounts ol currents supplied to the motor. limerspoodsol the motor. 21.1 nserormotore'onorotor is employed. At on lllltlltlttl llt *n l Cult. 1 Attor the tensor has hoen out out, tho ourl speed ol tho motor, the tens r or motor orzitor is diseonneeted or out out ol on rent is entirely supplied from the main supply oireuit.

ln adjusting the cylinders ol' .n printing press, it is neoessnry that the machine he driven. very slowly and l'requontly stopped and st :irted. it is therel'ore 'neoossory that the operator have eomplete oontrol ol' the Illtltltlllt t all times. It there is only :1 singlo oontroller handle loentod :it :1 distance lrom the mnohine, eonsidernhlo time mid inhor may he expended hel'ore tho ports are in proper adjustment tor the \Yttl'lilllg speeds. Furthermore in ease of :n-oident or hrenltdown, :1 oontrollor should always he within reach ol' the operator so that the machine onn he instantly stopped.

The ohjoot ol my invention is to provide moans whorohy at system ol' motor eontrol, in whioh n motor-generati r or tensor is em ployed l'or eortnin speeds, may he eontrollod ill any remote dist tllltt or at a variety ol positions ahout. the driven nniehine. whereh tho hitter will he under more perl'eet control ol" the. operzn or.

In ourrving' out my invention 1 provide olect'romtignetieiilly operated menus tor eonl trolling the motor-genortitor or converter, l wherohy the hitter "con no out into or out ol eirenit from any desired position. in another aspect my invention consists in it system ol' motor control. 11 motor, a main source ot eurrent supply for tho motor, an auxiliary souroo. ol supply for the some, at power operated oontrollor ior controlling the connections hetween .sziid sources or supply and the motor, and means for oont'i lling the operation 01 said controller from one or more distant points.

More soot-ilionllv considered. inv invention l t I motors in whiolrsystom u motorgenorzitor is connoot in; the main driving motor and motor ol the moi or-genemtor to a supply eireuit, a plurality of sections of resist once in circuit with the motor and motor-genernt or, a. solenoid operated switch .l'or eontrohing: ezn-h ol' :Szlid sections of esistance, it solenoid operated switch for in luding in circuit; or for outting out. oi oirenit tho monir-generzitor, and it manually operated control er tor operating till the switches.

My invention further consists in the arrangements of parts and electric circuits, and oomhination of elements, described in the specification and set forth in the appended claims.

l l l For a better understanding of myinven- E tron, reference is had to the accompanying drawing which is a diagrtnn of my invention. l l have shown at l, 2 the positive and hopetive conductors of the main source ol current t Supply. The. main driving motor is shown l at A tnnl consists of the armature 3, series ltiold 4, and shunt. field 5. At B, I have i shown the tensor, converter or motor-gent orator set, consisting in this case of the motor 1 armature t5, motor shunt field 7, generator armature 8, generator shunt field 2), and generator series field 10. The generator of this n10torgenom'tor set constitutes an auxiliary source of current supply for the main motor A.

Connected to the positive main l 1 by con duct-0r 11 is it variable resistance 12. This l, resistance is divided into sections 13,14, 15, and 16 which are adapted to he short-ciri cnited respectively by p0wer-0pereted t switches 17, 18, 19, and 20, in this case solenl oid operated. A solenoid switch 21 is proo-onsists in u system ol control for electric employed for the lowest speeds. moans lor vided for closing the main circuit through the resistance", as will be explained later. The

stationary contacts 22 of the switchesare connected by conductors 23 to the sectlons of the resistance. The pivoted contact blades 24 are each connected by a conductor each of the switches 17 to 21. '15

25 to a conductor 26 which is ada ted to be connected to the seriesfield win ing 4 and armature 3 of the mam driving motor A either directly or through the motor arma tiire 6 of the motor-generator set B, depend- 1 ping on the position of the controller handle.

A solenoid coil 27 is provided for operating, The cores of the solenoids consist of arms 28 attached to theblades 24. As will. be explained later these solenoid cores are adapted to be energeneratorof the motor-generator set.

gized successively by one or moremaster controllers located at anydeslred remote positions.

.. A double-throw solenoid operated switch 29 is adapted to control the connections of is connected'by conductor 39 to contact 33.

Contacts 34 and 35 are connected respectively by conductors and 41 to the terminals of the series field winding 10 of the generator of the motor-generator set B, the conductor 40 being also connected by conductor 42 to the positive brush of the generator armature 8. Contacts 36 and37 are connected to conductor 43 leading to the seriesfield 4 oid coils 46 and 47.

and armature 3 of the main driving motor A. Contact 38 is connected by conductor 44 to conductor 26 leading from the resistance 12 as is shown. The arm'29 of the switch 29 carries at its upper end a horizontal arm 45, the ends of whic form the cores of the solen- These solenoid coils are adapted to be energized respectively to throw the switch blades to the right and to the left. In series with the shunt field winding 5 of the motor A is the resistance 48 divided into sections 49, 50, and 51. These resistances are normally short 'circuited by solenoid operated switches 52, 53, and 54. These switches are adapted to be opened successivel to cut into. circuit resistances I .49, 50, an. '51 to Weaken the shunt field 5 to increase the speed of the motor, as will be explained later. The negative brush of the main driving motor A is connected by conductor 55 to the negative supply main 2.

The shuntfield windings 7 and 9 of the motor generator-set are connected to the supply main 1 by conductor 56, and 'to conductor main 2. The contacts 77, 78,

55, .which leads to supply main 2, by conductor 57.' The solenoid operated switches 17, 1s, 19, 20, 21, 29, 52, 53, s4, s0, and s1 control the various circuits and connections for obtaining the different speeds. These switches constitute the main, or power operated, controller. The power operated controller may hemadc in compact form and may be located in any desired position relative to the motor or driven machine.

A"n1aster-controllcr C, which may be located at any remote distance from the parts just described, consists ofa pivoted handle divided into three insulated sections 58, 59, and and four series of contacts I), E, F, (i arranged in arcs of concentric circles. As is shown, the series I) consists of contacts 62, 63, 64, 65, 66, c7, cs. 69, 70, 71, 72, and 73. Series E consists of two long contacts 74 and 75.. Series F consists of single contact 76 and series G consists of three contacts 77, 78, and'79. i

As is shown in the drawing, the solenoid operated switches 80 and 8]. are located adjacent the solenoids 46,47 of the switch 29. The solenoid coil 82 of the switch 80 is connected by conductor 83 to contact 62 at the left of the controller. The coil 82 is in series with the solenoid coil 46 which is connected by conductor 84 to the negative supply main'2. The solenoid coil 85 of switch 81 is connected to contact 68 by conductor 86 and is in series with the coil 47 which is connected to conductor 84 and to the supply main 2. The switch 80 has a stationary contact 87 connected to conductor 83 previously described, and a movable contact blade 88 connected byconductor 89 to contact 74 of series E. Switch 81 has a stationary contact 90 connected to conductor 86 and coil 85, and a movable contact blade 91 connected by conductor 92 to contact 75 of series E.

Contacts 63 and 69 are connected to solenoid coil of switch 21 by conductor 93. Contacts 6.4 and 70 are connected to the coil of switch 20 by conductor 94. Contact and 71 are connected to the coil conductor 95. Contact 66 and 72 are connected to coil ofswitch 18 by conductor .96. Contacts 67 and 73 are connected to coil 27 of switch 17 by conductor 97. All the solenoid coils are connected by conductor 98 to the positive'supply main 1. As is evident from the drawing the contacts of the groups D and E are adapted to be bridged by the outer section 60 o the operating switch.

As is shown, the contact 76 is connected by conductor 99 to the negative supply and 79 are connected respectively by conductors 100, 101, 102 to the solenoid coils of the switches 52, 53, and 54 which control the variable resistance 48. As is shown, these switches are normally closed, but' are opened when their of switch 19, by-

respective solenoid coils are energized. The

contact 76 and the contacts 77, 7S, and 79 i are adapted to be bridged by the middle section 59 of the controller handle. The section 59 of the handle is prmiided with a laterally ixtending lug 103, which engages the lug 77 and 78 when the switch is at its extreme right hand position in order that the coils of the switches 52 and 5:) may continue to be energized and the switches 51? and held in the open position after the controller handle has been thrown to this osition The operation of the parts escribed will now be explained. \Vhen' the printing press driving motor is at resttbe master-controller handle will be at the extreme left hand position. in this position the switches 17 to 2]. 29, so, in. 81 will be open. Now, if it is deto sta the machine slowly the controller .1 moved to the right until the section so gages the contacts 62, 63, and 74. .icen that in this position of the con handle, the circuit is completed thrr v 1. the solenoid coil of the switch 21 through the coil 8'2 of switch S0 and through the coil 46 of switch 29 as followsz lrom suppl r main 1, conductor Q8, solenoid of sa l, conductor 93, contact 63, contact 62:, conductor 83, solenoid coil 82, solenoid coil so. conductor 84 to negative supply main 2. The solenoid cores and hence the contact blades of the switches 21 and will be rd and these switches will be closed;

tl .ital arm 45 of switch will be t n n the left and contact blades 30 and 31 will .flldgfi the contacts 33 and. 34, and 355 and 2:,v The motor will now be driven at Its slowest speed and tbqmain. driving c cuit is as follows ;-l'roin quain 1, conductor 11, sections 13, 14. 15, and..16 of resistance 12, switch 21, conductor 26, armature {3 of n 'otongenorator set, conductor 39, con- 30. conductor 40, series field 10 of K orator of the inotor generator set, conductor 4]., contact blade 31, conductor 43, field 4 of the driving motor A. armature 3 of the motor, conductor to negative supplyinain 2. Generator 8 also supplies current to the motor A and the circuit of the generator is as follows: positive brush of the armature of generator 8, conductor 42, field 10, conductor 41, contact blade 31, conductor 43. series field 4 and armature 3 of driving motor A to the negative brush of the armature 8. It is seen that the motor armature 6 is in series with the main driving metor A, both of which are supplied with eurrent from supply mains l, 2. The armature 8 of the generator, which may be mounted on the some shaft as the armature 6 of the motor, liliewise supplies low potential current to the driving motor. The current of the drivnginotor A is of high amperage and low strong starting torque. To increase the speed oi the driving motor and oi the machine, the iouster-controller handle moved to the right. the controller handle moves from the contact (3;? the circuits above traced will remain completml because the switch W now closed.

ll will be seen that the switch 80 will be moint ncd closed until section (ll) of the controller bundle is moved beyond the contact 67. when the circuit. through the coils R2 and ill will be interrupted and the swit hes 50 and Ill will be opened. As the controller handle moves from contact (5.; to contact til, the solenoid coil ol switch lOwill be ener gized and the latter switch will be closed sbori-circuitiug the section lll ol the resistlZ. The armaturcs 6 and h ol" the motor-generator set will now be driven at a higher speed. and current of higher potential will besupplicd to tbe driving motor A which results in increased speed. in the siinila: manner as the controller bundle is moved successively from contact til to con-- tact 67 the resistances l5, l4, and it; will be .rccessivel3' short-circuited and the speed increased step by step.

\Yben lbe controller bandlo engages the contact (37, the motor is driven at tbeliigbest speed which can be obtained with the motorgene'ator set in circuit. As the controller handle is moved ahead lrom contact 67, the circuit to the coil of the solenoid switch l7 and through the solenoid coils H2 and lti are broken. As the bundle is moved still lurtlier to the right until it bridges the conlncts ($8 and till the circuit through the switch opting conductors will again be. completed. 'l ne coninlctions are then as l'ollows:froni supply main l, conductor J8, solenoid coil of switch 21, conductor 93, contact tllhcontact 68, conductor S6, coil of switch 81 coil 47; coni'lucloiflsl tosupplynnlin 2. Switches 2] and Ni will now be closed and switch arm 29 will be thrown to the lel'l. contact blade. 1-12 bridging the cont actsil? and 38. The closing of the switch Sl allows the controller arm to be nun ed ahead l'rom contact 68 without interrupling the circuit just traced. It is seen that when the controller bundle is on contact ()9 the main circuit through the motor is as follows: from supply main 1, comluctor l 1, all the rosistancefiwlions l3, ll, 15, and 16, switch 2i, conductor 26. colnluctor 44, conmct blade 32, conductor 42%, series lield 4 and armature 2% of main driving motor A, conductor to supply main ltis seen that the niotoreuorator set is now out ol" circuit and that the current is supplied directly to tbe armature of the motor through the resistance sections 13. 14, 15, and 16. By moving the controller handle from contact 62) to 73 successively further increases in speed are obtained, the solenoid switches connected to the contacts (it) to 73 11351300 i dl ' the controller handle is switches tively, being successively closed and resistance sections 16, 15, 14, and 13 being successively short-circuited.

Solar, the switches 52, 53, 54 have been closed and the resistance sections 49, 50, and 51 have all been short-circuited, or out'of l the shunt field circuit 5 ofthe motor A. To still further increase the speed of the motor, moved further to the right until the contacts 76 and 77 are bridged by the section 59 of the handle. The auxiliary or switch controlling circuit is now completed asfollowsz-from main 1, conductor 9S, solenoid coil of switch 52, conductor 100, contact 77, section 59 of the controller handlc,contact 76, conductor 99, sup- 1 ply main 2. Switch 52 will 'now be opened and the section 49 of the resistance 48 will be inserted in series with the shunt field winding 5. The field magnetization will there fore be decreased and the speed of the motor will be increased. It will be noted that contacts 73 and 75 are still bridged by the section 60 of the controller handle, thus the circuit through the solenoid coil of switch 17 will remain completed and this switch will remain closed for further movement of the handle to the right. The switch SI and switch 29' will be maintained in their closed osition long as the contacts 73 and 75 are lirid ed by the section of the controller handle. ()n moving the controller handle still further to the right switches 53 and 54, will be opened in succession and resistance sections 50 and 51 will be inserted, together with the resistance 49, in series with the shunt field 5, tlms still further increasing the speed of the driving motor. When the switch is at. its extreme right hand osition, with the section 59 of the handle bridging contacts 76 and 7!), lug 103 on the section 59 l maintains the circuit through the coils of the 52 and 53 closed.- Thus all the switches 52, 53 and 54 will be held open. The motor A is now-driven at its highest speed.

I If it is desired to stop the motor, the controller handle can be moved either to con- If the slow speeds at starting are not desired the operator will stop the motor with the controller handle on contact 68 and then by movements of the l handle to the right running speeds can'be quickly obtained without subjecting the motor to the very low speeds obtained with the motor-generator set. If however, the operator desires the low speeds, the machine will be stopped with the controller handle at the extreme left, then if he desires to start the machine or to drive it slowly for making necessary adjustments of any of the parts of the machine as for adjusting the cylinders of the printing press, the cont-roller handle will be moved slowly to the right when the I motor-generator set will be in circuit.

All the switch controlling conductors connccted to the supply mains and to the contacts of the master-controller can be of comparatively small size and hence said mastercontroller can be located at any distance remote from the main controller and other operating parts of the system and can therefore be located in the most convenient place. Not very heavy currents are required to operate the different switches of the main controller and therefore the master-controller and its contacts can be made small. This is an important feature for the reason that the master controller can then be operated by auxiliary levers or master controlling handles located at a variety of places about the driven machine. These auxiliary controlling handles can be connected to the master-controlling handle by means of any suitable system of rods and levers, one rod of said system being-illustrated at 105. The conductors connected with the contacts of the master-controller may if desired be extended as indicated at 106 to connect with corresponding contacts of one or more sepa lar to that shown at C. I may operate the power operated controller from a variety of positions not only by a number of auxiliar controller handles connected to the handle of the master controller C by a system 0t links and levers as described, or byone or more electrically connected master controllers, but if desired I may employ both systems. For example, I may employ two or more electrically connected master controllers to the operating handle of each of which may be connected by links and levers one or more of the auxiliary handles.-

I do not wish to be confined to the details shown or the exact arrangements of switches and circuits. I aim in my claims to cover all modifications which do not depart from the spirit and scope of my invention.

What I claim as new and. desire to secure by Letters Patent is 1. In combination, an electric motor, a supply circuit, means for connecting the motor with the supply circuit with the motor and with-the supply circuit toassist in supplying said motor,

and electro-magnetically operated means for circuit, a converter in circuit with the motor and with the supply A circuit, a solenoid operated switch for connecting the converter to, and disconnecting the converter from, the motor and the su circuit, and means for controlling said switcl 3. In combination, an electric motor, a supply circuit, a converter, electro-magnetical y op'e'rated means for connecting the con- Verter with the supply circuit and with the pp y Cir

motor and for disconnecting it from both, it l rheostat in the converter circuit, and electrol magnetically operated means for controlling l said rheostat.

l. In combination, an electric motor, a 1 supply circuit, means for connecting the mo l tor with the supply circuit, a converter in cirl cuit with the motor and with the supply cirl cult, i1 rhcostat in the supply circuit, eloctrol maqnetically operated means for controlling said rheostat, and electromagnetically oper- 1 ated inet'tns for breaking the converter cir- 1 cuit at an intermediate speed of the motor. lln combination, on electric motor, at supply circuit, means for connecting the mol to: with the sup )ly circuit, it variable resistance in the supply circuit, a converter in circuit with the motor and with said supply cirl cuit, solenoid o aerated switches for control ling the variable resistance, a solenoid operttlOtl switch for breaking the converter cirl cuit at an intermediate speed of the motor, l and menus lor controlling said switches. l 6. ln a system of control, a supply ctr l 't, a motor connected with said upply l C circuit, motor-generator set connected with l said supply circuit and with said motor, I phirality of resistance sections in circuit with said motor and moon-generator set, a solenold for controlling each of said resistance sections, solenoid operated switch for l melting or breaking the connection between the motongenerator set and the source of I sup ly and the motor, and means for conl trolling all said solenoid switches. 7. In combination, on electric motor, supply circuit, means for connecting the ill-I tor with the supply circuit, a rainverter in circuit with the motor and the supply circuit, l clettro magnetically operated means 'lor varying the strength of the current in the converter circuit and electroenugnetically operated means for disconnecting the convertcr at an intermediate speed of the motor. l 8. In combination, an electric motor, a supply circuit, means for connecting the mol tor with. the supply circuit, a converter hav i ing its primary connected with said supply l circuit and its secondary to said motor, clcctro-nmgnct'iczilly operated. means for controlling the current supplied to said motor l and to the wrimary of said converter, electrol magnetically operated means for breaking the converter circt't at 1.11 intcr'nleditttcl snccd of the motor, and means for controh hug cli said electro-magneticslly operating;

means.

J. in at sistem of control tor electric io- J tors, a. supply circuit, a nzotorcnerzttor set,

means i'or connecting; tne sup" l circuit to the motor ol" the motor-g llttt'ttttfl set and to the main motor, means for ciginnet'inig the generator ol the ntotor-generator Sat to the main motor, a plurality of sections oi resistsaid. sections of resistance,

controlling all tor, an auxiliary source once in circuit with the motor and motorgenerator set, a solenoid operated switch for controlling each of said set-t i ns of resistance, a solenoid ijipera-ted. switch l or controlling the motor-generator circuit, and a nuinually operated controller for operating all said switches.

it). in a system of control, a supply cirunit, a motor, means for connecting said motor to the supply circuit, a converter, means for connecting said converter to its supply circuit and to the motor, a plurality of sections of resistance in circuit with the converter and motor, elcclro-niagneticully operated ineans'ior controlling step by step\ cleetromagnetically operated means for breaking the converter circuit at an intermediate speed of the motor and for connecting the motor through the resistance sections to the supply circuit, and means for controlling said elcctro-mag net-ically operated means.

in 11 system of control, uit, a motor having a shunt field, it variable resists-3e in said shunt lield circuit, means for connecting the motor to the supply cit cuit, a converter, means for connecting; suid converter to the supply circuit and to said motor, a variable resistance in said converter circuit, e

a supply cirmetro-magnetics lly operated means for controlling step by step the resistance in the converter circuit, electro-rnaunetieally operated moons for making or breaking, the converter cicuit, electro-magrnetically 0J- crrited means i'orcontrolling step by step too resistance in suid shunt lield circuit of the motor, and. manually operated means for the diii'erent elcctro-mttgncticaily operated means.

12. In a system ol' control, it supply circuit, a motor having a shunt field, in series with which is it veriahie resistance, a convcrtcr having its primary connected to said supply circuitand to said motor and having, its secondary connected to said motor, a variable resistance in series with the primary oi the converter and the motor, a pluralit ol' solenoid operated switches lor conllOlllIlt: said resistance step by step, a colon oid operated switch for breaking the convert-er circuit at in: intermediate speed oi the motor, a plurality ol' solenoid operated switches for controlling step by step the resistance in the shunt licld circuit of the motor and it controller for all said switches. in. {L system of niolor control, a motor, a main source oi? current supply lor said mool' supply l'or the controller l'or con same, a power operated necting said two sources ol supply to the mo tor simultaneously and for disconnecting the auxiliary source 'ol" supply, and means for controlling the operation ol' said controller from a distant point.

i-i. lo a system of motor control, a. motor,

a main source of current supply for said motor, an auxiliary source of supply for the same, a power operated controller for controlling the connections between said sources of supply and the motor,'and a plurality of master controllers for the operating means of said power operated controller.

15. In a system of motor control, a motor, a main source of current supply for said motor, a generator as an additional source of current supply therefor, a power operated controller for connecting said motor to said two sources in parallel or to only one of said sources, and means for controlling said power operated controller from a distant point.

16. In a system of motor control, a motor,

' a main source of current supply and an auxnected to the iliary source of current supply for said motor, a .power 0 )erated switch for connecting said sources 0 supply in different relations to said motor, and means for controlling said power operated switch distant points.

17. In a system of motor control, a motor, a main source of current supply for said motor, a converter as an additional source of current supply therefor, power operated means for connectingsaid motor to be suplied from said two sources in parallel or ronr one only of said sources, and means for controlling said power operated means from a distant point. j

18. In a system of motor control, a motor, aumain source of current supply, and a converter as an additional source of current supply for said motor, a poweroperated controller for connecting said sources of supply in different relations to said motor, and a plurality of master controllers for governing said power operated controller. Y

19. Ina'system of motor control, a motor, a main source of current supply for said motor, a motor-generator adapted to be connected to said source of supply and to said motor, a power operated controller for con-' meeting said ma1n source of supply and mo tor-generator to said motor, either singly or in parallel, and means for controlling said power operated controller from one or more distant points. L

20. In a system of motor control, a motor, a main source of current su ply for said motor, an auxiliary source 0 current'supply therefor, an electro-magnetically operated switch for controlling the connections hetwcen the sources of supply and the motor, and means for controllingsaid electro-magnetically operated switch from a plurality of distant points.

21. Inasystem of motor control, a motor,

a main source of current supply for said motor, a motor-generator adapted to l)0 con source of supply and to said from a plurality of for controlling the connections between the main source of supply, the motor-generator, and the motor, and a pluralityof master-controllers for governing said elect'rc-magnetically operated means.

22. -I n a system of motor control, a motor,;

.ammm'gsource of current suppl for said mo,

tor, iindfan auxiliary-source ofsupply,tl1erefor comprising a n1otor-generator,- elctroe magnetically operated switches for controlling the connections between the sources of supply and. the motor, and a plurality of master-controllers for said switches.

23.). In a system of motor control, a motor,

a main source of current supply for said motor, and a motongenerator as an additional source of current supply therefor, an adj ustable rheostat, electro-magnetically operated means for connecting said motor and adjust-- able rhrostat in magnetically operated meansfrom one or'.

more distant points. a 5

25. In a system of motor control, a'niotor, a supply circuit, means for connecting the motor with supply circuit, a converter in circuit with the motor'and with the source of supply, an elgctroanagnetically operated switch f or connecting the converter to, and disconnecting the converter from, thel motor and the supply circuit, and means for controlling said switch from due or more distant points. I

26. In a system of motor control, a su ically operated means converter with the so a motor,

for connecting the ply circuit and with pply circuit, a converter, electro-magnetthe motor and for isconnecting it from.

both, a rhcostat in the converter circuit, eleo tro-nnignetically operated switches for con.

trolling said rheostat, and one or more master controllers for operating said switches.

27. In a system of motor control, amotor, a supply circuit, means for connecting the motor with the supply circuit, a converter in circuit with the motor and supply circuit, an adjustable rheostat in the electni-magnetically-operated means for controlling the rheost-at and for breaking"v the converter circuit at an intermediate speed of and one or more master controllers the motor,

for operating said' means.

28. In a system ol motor control, a supply circuit, a motor.connected to said supply circuit, a converter in circuit with the motorand the supply circuit, electro-magnetically pp y cir operated means for varying the strength ot the current in the converter circuit, electromagnetically operated means l'or cutting the converter out of circuit at an intermediate speed of the motor, and one or more master controllers for operating said means from one or more distant oints.

29. In a system 0 motor control, a motor, two sources of current supply, and remotely controlled means for connecting said motor to the two sources of supply in parallel or to one of said sources alone.

30. In a system of motor control, a motor,

two sources of current supply, means for connecting said motor to the two sources otSupply in paraliel or to one of said sources alone, and means tor governing said first mentioned means from a plurality of points.

31. In. a system of motor control, a motor, two'sources of current supply, and electroma netically operated means for connecting sai motor to the two sources of supply in parallel or to one of said sources alone.-

- 32. In a system of motor control, a motor, two sources of current supply, electromagnetically operated means for connecting said motor to the two sources of supply in parallel or to one of said sources alone, andremote means for overning said electromagnetica lyoperate means.

In a system of motor control,'a motor,

a main source of current supply, a motorgenerator set, and electro-magnetically operated means for connecting the generator of said motor-generator set 1n parallel with the main source of supply to supply the motor, and for disconnecting said generator.

1' 34. In a system of motor control, a motor, ,a main source of current sup 1y, a motorgenerator set, remotely contro led means for 1 connecting the generator ol' said motor-generator set in parallel with the main source oisupply to supply the. motor, and for disconnecting the motor generator set.

35. In a system ol motor control, a motor, two sources of current supply, and remotcl y 1 controlled means t'or connecting said motor to be supplied bysaid two sources jointly or by one of said sources alone.

two sources of current supply, means tor eonnecting said motor tobe supplied from said two sources jointly or from one of said sources alone, and means for governing said controlling means from a plurality of points. I

37. In a system of motor control, a motor, two sources of current supply, and electrically operated means for connecting said m0- tor to be supplied by said two sources of current jointly or by one of said sources alone.

38. In a system of motor control, a motor, two sources of current supply, electrically operated means tor connecting said motor to be supplied by said two sources oi. current jointly or by one of said sources alone, and

WILLIAM F. SCHNEIDER.

\Vitnesses ARTnun'F. Kwis, FRED J. KINSEY.

36. In a system oi motor control, a motor,

means for governing said controlling means. 

